19521 Chaos

Classical Kuiper belt object October 2019 yes #C2E0FF 19521 Chaos 24px (astrological) Deep Ecliptic Survey 19 November 1998 17 October 1991 19521-chaos hst.jpg 19521 Chaos as imaged by the Hubble Space Telescope in September 2001 (19521) Chaos ˈ k eɪ . ɒ s 1998 WH 24 Chaotian k eɪ ˈ oʊ ʃ ən Chaos TNO (cubewano) 13 January 2016 (JD 2457400.5) 5902 days (16.16 yr) 2 12.5 AU Tm on 35.8 AU Tm on 5.884 45.796 AU Tm on 40.957 AU Tm on ≈ 23 December 2033JPL Horizons Observer Location: @sun (Perihelion occurs when deldot changes from negative to positive. Uncertainty in time of perihelion is 3-sigma.)±10 days 50.636 AU Tm on on 0.10567 309.92 yr (113199 d) 12.0502° 50.0239° 58.4097° 337.2998° 4.3931 km/s 1? (compact or contact binary) 415 83 30 km equivalentJosé María Gómez-Limón Gallardo et al. (2024) New evidence that (19521) Chaos might be a large compact binary600 140 130 km665 ~ B–V=0.95 0.03V–R=0.63 0.03V–I=1.25 0.04 4.64<ref name=jpldata/>5.0 0.1 (calculated) 0.00318023 ms / day 19521 Chaos (provisional designation 1998 WH 24) is a cubewano, a Kuiper belt object not in resonance with any planet. Chaos was discovered in 1998 by the Deep Ecliptic Survey with Kitt Peak's 4 m telescope. Occultations suggest it is a compact or contact binary equivalent to a sphere 400 to 500 km in diameter. On 20 November 2020, Chaos occulted a magnitude 16.8 star. Three observers detected the occultation, finding that the object is likely smaller than 600 km in diameter. Another occultation was recorded on 14 January 2022; full results on size, shape, geometric albedo, and the spin-axis orientation have not been released.February 2023 A further occultation occurred on 28 September 2023, with a shadow crossing most of North America. This occultation was observed by over 30 observers;Gault Dave OccultWatcher Cloud https://cloud.occultwatcher.net/event/1000-19521-87528-649970-U028826/1103807 OccultWatcher 29 September 2023 preliminary analysis suggests that Chaos is a binary (possibly a contact binary).https://ui.adsabs.harvard.edu/abs/2023pses.conf80462G/abstract 2023pses.conf80462G Chaos: Stellar Occultations Reveal a Binary Tno? Gómez-Limón Gallardo José María Leiva R. Ortiz J. L. Desmars J. Kilic Y. Vara-Lubiano M. Santos-Sanz P. Kretlow M. Rommel F. L. Morales N. Fernandez-Valenzuela E. Souami D. Lucky Star Team Observers of Nov. 2020, Jan 2022, Dec 2022 Mar 2023 Occultations Seventh Edition of the Spanish Meeting of Planetary Sciences and Exploration of the Solar System (7Th Cpess 2023 Name On 28 March 2002, it was named after the primeval state of existence in Greek mythology, from which the first gods appeared. Planetary symbols are no longer much used in astronomy, so Chaos never received a symbol in the astronomical literature. There is no standard symbol for Chaos used by astrologers either. Michael Moorcock's Symbol of Chaos (16px) has occasionally been used.https://www.unicode.org/L2/L2021/21224-dwarf-planet-syms.pdf Unicode request for dwarf-planet symbols Miller Kirk 26 October 2021 unicode.org Orbit thumb|A recreation of the 2023 occultation Chaos has an orbital period of approximately 309 years. Its orbit is longer, but less eccentric than the orbit of Pluto. Chaos's orbit is inclined approximately 12° to the ecliptic. Its orbit never crosses the orbit of Neptune. Currently, the closest approach possible to Neptune (MOID) is 12.5 AU e9km e9mi 3 unit on. Chaos will come to perihelion at around December 2033, coming as close as 40 AU e9km e9mi 3 unit from Earth. Its brightest magnitude will be 20.8. References 25em 2007-12-14 last obs 19521 Chaos (1998 WH24) JPL Small-Body Database Browser https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Chaos 11 April 2016 Thayer 1994 Gray World, Green Heart Wiley 9780471572732 https://archive.org/details/grayworldgreenhe00thay_0 registration April 2020 Buie, Marc W. Marc W. Buie Orbit Fit and Astrometric record for 19521 2004-11-09 SwRI Space Science Department http://www.boulder.swri.edu/~buie/kbo/astrom/19521.html 2008-09-28 dmy-all (19521) Chaos = 1998 WH24 IAU Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=Chaos 2018-02-10 dmy-all "TNOs are cool": A survey of the trans-Neptunian region VI. Herschel / PACS observations and thermal modeling of 19 classical Kuiper belt objects https://archive.org/details/arxiv-1202.3657 Vilenius, E. Kiss, C. Mommert, M. Müller, T. Santos-Sanz, P. Pal, A. Stansberry, J. Mueller, M. Peixinho, N. Fornasier, S. Lellouch, E. Delsanti, A. Thirouin, A. Ortiz, J.L. Duffard, R. Perna, D. Szalai, N. Protopapa, S. Henry, F. Hestroffer, D. Rengel, M. Dotto, E. Hartogh, P. Astronomy and Astrophysics 2012 541 A94 10.1051/0004-6361/201118743 free 1204.0697v1 2012A&A...541A..94V 54222700 6 MPEC 2008-O05 : Distant Minor Planets (2008 AUG. 2.0 TT) 17 July 2008 Minor Planet Center https://www.minorplanetcenter.net/mpec/K08/K08O05.html 2011-01-08 dmy-all The color distribution in the Edgeworth-Kuiper Belt A. Doressoundiram N. Peixinho C. de Bergh S. Fornasier Ph. Thébault M.A. Barucci C. Veillet October 2002 The Astronomical Journal 124 4 2279–2296 10.1086/342447 astro-ph/0206468 2002AJ....124.2279D 30565926 etal Mónica Vara-Lubiano Nicolás Morales Flavia Rommel José Luis Ortiz Bruno Sicardy Pablo Santos-Sanz The multi-chord stellar occultation by (19521) Chaos on 2020 November 20 https://meetingorganizer.copernicus.org/EPSC2021/EPSC2021-626.html September 2021 15th Europlanet Science Congress 2021 Europlanet Society EPSC2021-626 10.5194/epsc2021-626 2021EPSC...15..626V 26 June 2022 free etal José Luis Ortiz Nicolás Morales Mónica Vara-Lubiano Mike Kretlow Bruno Sicardy Pablo Santos-Sanz The Trans-Neptunian Object (19521) Chaos as seen from stellar occultations and photometry observations https://meetingorganizer.copernicus.org/EPSC2022/EPSC2022-520.html September 2022 16th Europlanet Science Congress 2022 Europlanet Society EPSC2022-520 10.5194/epsc2022-520 2 January 2023 free subscription External links http://cfa-www.harvard.edu/mpec/J98/J98X08.html Original Minor Planet Electronic Circular (1998-X08) for 19521 Chaos http://cfa-www.harvard.edu/mpec/J99/J99V03.html Revised Minor Planet Electronic Circular (1999-V03) 19521 Chaos 19521 19521 Category:Classical Kuiper belt objects Category:Discoveries by the Deep Ecliptic Survey Chaos 19981119 Chaos Category:Long stubs with short prose